brass vs authorities

brass and authorities both are nouns.

Word	Noun	Adjective	Verb	Adverb
brass	Yes	No	No	No
authorities	Yes	No	No	No

brass (noun)	authorities (noun)
a wind instrument that consists of a brass tube (usually of variable length) that is blown by means of a cup-shaped or funnel-shaped mouthpiece	the organization that is the governing authority of a political unit
a memorial made of brass
an ornament or utensil made of brass
impudent aggressiveness
the persons (or committees or departments etc.) who make up a body for the purpose of administering something
the section of a band or orchestra that plays brass instruments
an alloy of copper and zinc